When a patient has a sprained foot, the following methods can be used to determine whether there is a bone injury: First, look at the diagnosis: If there is a bone injury, you can see a significant deformity in the appearance, as well as local bruising and swelling, then an X-ray examination should be performed to make a diagnosis. Second, palpation: after a foot sprain, if the sound of bones rubbing against each other can be touched at the injury, it can be judged that there is a bone injury. Third, auxiliary examination: diagnosis is made by X-ray film as well as CT examination, for injuries with obvious fracture displacement. If wire-like fractures or fractures without displacement are not visible on X-ray in some patients, CT examination can be used for diagnosis and treatment.